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CryptoHack

A fun, free platform for learning modern cryptography

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Learn By Doing

Learn about modern cryptography by solving a series of interactive puzzles and challenges. Get to know the ciphers and protocols that secure the digital world by breaking them.

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Level Up

Earn points by solving challenges. Finish categories to earn trophies and gain levels to track your progress. Can you reach the top of the scoreboard?

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Fresh Challenges

We are constantly creating new challenges to keep your crypto knowledge up to date. Expect exciting brainteasers and whole new categories as the site continues to grow.

New Challenges
RSA or HMAC? Part 2 Crypto on the Web 100
Roll your Own Mathematics 125
Dancing Queen Symmetric Ciphers 120
SSH Keys General 35
LFSR Destroyer Misc 250
Weekly Top Users
#1 aaanomy 2165
#2 terrynini38514 2090
#3 heabi 1780
#4 CaptainJamel 1470
#5 y73n0k 1325
Recent Solves
Everything is Big KennedyS
Favourite byte 001132
You either know, XOR you don't OriginWormy
XOR Properties Shivaminc
Favourite byte OriginWormy
Recent Solutions
Scalar Multiplication Hamilton 0
ProSign 3 terrynini38514 0
You either know, XOR you don't 0x3ashry 0
Favourite byte 0x3ashry 0
Greatest Common Divisor 0x3ashry 0

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